fix: lab 06

Author: kuroidoruido

steps/06-scaffolding-solution/tests/guestbook.spec.ts

@@ -30,7 +30,7 @@ test.describe("new message", () => {
     const message = "This is a message from the future! " +
       Math.floor(Math.random() * 1_000_000);
     await newGuestbookMessageFormPage.fillForm({ author, message });
-    await newGuestbookMessageFormPage.submitButton();
+    await newGuestbookMessageFormPage.submitButton().click();
 
     await expect(newGuestbookMessageFormPage.submitSuccessMessage())
       .toBeVisible();

steps/06-scaffolding-solution/tests/page-object/admin-guestbook.page.ts

@@ -4,7 +4,7 @@ export class AdminGuestbookPage {
     constructor(private page: Page) {}
 
     manageGuestbookButton() {
-        return this.page.locator("button", { hasText: "Manage guestbook" });
+        return this.page.getByRole("button", { name: "Manage guestbook" });
     }
 
     title() {